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Provisions for Federal and State Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current Income Tax Provision      
Federal $ 0    
State 351 $ 355  
Total Current Income Taxes 351 355  
Deferred Income Provision      
Federal 9,340 5,032 $ 13,675
State 4,117 3,006 3,862
Total Deferred Income Taxes 13,457 8,038 17,537
Total Income Tax Expense $ 13,800 $ 8,400 $ 17,500